Server-Side Data Processing
Documentation
In many cases, before being handed out to the client, data is processed on the server. The DevExtreme HTML5 Widgets support this scenario. In this demo, the data source of the Chart widget loads weather data for a selected month from an OData service. Each time the month is changed, the data source sends a new query to the service.
weatherbase.com
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@model IEnumerable<DevExtreme.MVC.Demos.Models.SampleData.MonthName>
@(Html.DevExtreme().Chart()
.ID("chart")
.DataSource(d => d.OData()
.Url("https://js.devexpress.com/Demos/WidgetsGallery/odata/WeatherItems")
.Expand("DayItems")
)
.DataSourceOptions(o => o
.PostProcess("function(d) { return d[0].DayItems; }")
.Filter(@"[""Id"", ""="", 1]")
)
.Title("Temperature in Barcelona, 2012")
.Size(s => s.Height(420))
.Series(s => s.Add()
.ArgumentField("Number")
.ValueField("Temperature")
.Type(SeriesType.Spline)
)
.Legend(l => l.Visible(false))
.CommonPaneSettings(s => s
.Border(b => b
.Visible(true)
.Width(2)
.Top(false)
.Right(false)
)
)
.Export(e => e.Enabled(true))
.Tooltip(t => t
.Enabled(true)
.CustomizeTooltip(@<text>
function(arg) {
return {
text: arg.valueText + "°C"
};
}
</text>)
)
.ValueAxis(a => a
.Add()
.ValueType(ChartDataType.Numeric)
.Grid(g => g.Opacity(0.2))
.Label(l => l
.CustomizeText(@<text>
function() {
return this.valueText + "°C";
}
</text>)
)
)
.ArgumentAxis(a => a
.Type(AxisScaleType.Discrete)
.Grid(g => g
.Visible(true)
.Opacity(0.5)
)
)
.LoadingIndicator(l => l.Enabled(true))
)
<div class="action">
@(Html.DevExtreme().SelectBox()
.ID("selectbox")
.Width(150)
.DataSource(Model)
.Value(1)
.ValueExpr("Id")
.DisplayExpr("Name")
.OnValueChanged(@<text>
function(data) {
var dataSource = $("#chart").dxChart("getDataSource");
dataSource.filter(["Id", "=", data.value]);
dataSource.load();
}
</text>)
)
<div class="monthlabel">Choose a month:</div>
</div>
using DevExtreme.AspNet.Data;
using DevExtreme.AspNet.Mvc;
using DevExtreme.MVC.Demos.Models.SampleData;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.Mvc;
namespace DevExtreme.MVC.Demos.Controllers {
public class ChartsController : Controller {
public ActionResult ServerSideDataProcessing() {
return View(SampleData.MonthNames);
}
}
}
using System;
using System.Collections.Generic;
namespace DevExtreme.MVC.Demos.Models.SampleData {
public class MonthName {
public int Id { get; set; }
public string Name { get; set; }
}
public partial class SampleData {
public static readonly IEnumerable<MonthName> MonthNames = new[]{
new MonthName {
Id = 1,
Name = "January"
},
new MonthName {
Id = 2,
Name = "February"
},
new MonthName {
Id = 3,
Name = "March"
},
new MonthName {
Id = 4,
Name = "April"
},
new MonthName {
Id = 5,
Name = "May"
},
new MonthName {
Id = 6,
Name = "June"
},
new MonthName {
Id = 7,
Name = "July"
},
new MonthName {
Id = 8,
Name = "August"
},
new MonthName {
Id = 9,
Name = "September"
},
new MonthName {
Id = 10,
Name = "October"
},
new MonthName {
Id = 11,
Name = "November"
},
new MonthName {
Id = 12,
Name = "December"
}
};
}
}
#selectbox {
float: right;
}
.action {
width: 270px;
margin-top: 20px;
}
.monthlabel {
padding-top: 9px;
}